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  <title>desired_tag (Karakuri)</title>
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  <pre><span class="ruby-comment cmt"># File lib/karakuri.rb, line 92</span>
  <span class="ruby-keyword kw">def</span> <span class="ruby-constant">Karakuri</span>.<span class="ruby-identifier">desired_tag</span>(<span class="ruby-identifier">query_string</span>)
    <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">query_string</span>
      <span class="ruby-identifier">start</span> = <span class="ruby-identifier">query_string</span>.<span class="ruby-identifier">index</span>(<span class="ruby-value str">&quot;tag=&quot;</span>)
      <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">start</span>
        <span class="ruby-identifier">start</span> = <span class="ruby-identifier">start</span> <span class="ruby-operator">+</span> <span class="ruby-value">3</span>
        <span class="ruby-identifier">stop</span> = <span class="ruby-identifier">query_string</span>.<span class="ruby-identifier">index</span>(<span class="ruby-value str">&quot;&amp;&quot;</span>)
        <span class="ruby-identifier">stop</span> = <span class="ruby-value">0</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">stop</span>
        <span class="ruby-identifier">desired_tag</span> = <span class="ruby-identifier">query_string</span>[<span class="ruby-identifier">start</span><span class="ruby-operator">+</span><span class="ruby-value">1</span><span class="ruby-operator">..</span><span class="ruby-identifier">stop</span><span class="ruby-operator">-</span><span class="ruby-value">1</span>]
        <span class="ruby-identifier">desired_tag</span> = <span class="ruby-constant">CGI</span><span class="ruby-operator">::</span><span class="ruby-identifier">unescape</span>(<span class="ruby-identifier">desired_tag</span>)
      <span class="ruby-keyword kw">else</span>
        <span class="ruby-value str">''</span> <span class="ruby-comment cmt">#fallback: return empty string to prevent nil errors</span>
      <span class="ruby-keyword kw">end</span>
    <span class="ruby-keyword kw">end</span>
  <span class="ruby-keyword kw">end</span></pre>
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